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How fast do different parts of the EM spectrum travel in a vacuum?

2 Answers
Nov 20, 2016


At the speed of light.


Remember that the EM spectrum are comprised of energy waves. Light is an energy and is part of the EM spectrum.

Speed of light in a vacuum is #299 792 458 m/s#. Most people round to #3.0xx10^8#. However the speed alters when travelling in through a medium, like water or air.

Hope this helps :)

Sep 28, 2017

All parts of the EM spectrum travel at #3*10^8 m/s#.